What were some inventions made possible because of the light bulb?

Which are in millennium development goals check all that apply

Prior to the presence of europeans on the continent, the slave trade in africa a) did not exist in any form. b) was limited to internal trade only. c) included the trans-saharan and indian ocean slave trade. d) was rarely needed due to the lack of an agricultural economy.

How have a past president and our current president abused the powers granted to the president of the united states by the constitution and the people ?